an incursion being imminent. >> information war, if you will, at the moment right now. nic, thank you so much for that. so with the threat of a russian invasion looming, the u.s. military and nato are ramping up their presence along the border between ukraine and poland which is where we find cnn's nick peyton walsh. they have stressed the u.s. will not fight in ukraine if russia invades so what's the purpose of increasing the troop levels there? >> reporter: in short, they are here just in case. just in case there is a war inside ukraine. remember, i am standing on the border furthest away the western end of ukraine. very quiet here. no refugees. what i have to tell you we saw yesterday they are here in quite significant numbers.